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Studies of CPT symmetry in positronium decays with 192 plastic strip J-PET detector

Fuente: arXiv

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Main Authors:	Chug, N., Bass, S. D., Beyene, E. Y., Curceanu, C., Czerwiński, E., Das, M., Eliyan, K. V., Gorgol, M., Hajduga, J., Jalali, S., Jasińska, B., Kacprzak, K., Kaplanoglu, T., Kapłon, Ł., Kasperska, K., Khreptak, A., Kierys, A., Korcyl, G., Kozik, T., Kubat, K., Kumar, D., Venadan, A. Kunimmal, Lisowski, E., Lisowski, F., Mędrala-Sowa, J., Moyo, S., Mryka, W., Niedźwiecki, S., Pandey, P., Parzych, S., del Río, E. Pérez, Porcelli, A., Rachwał, B., Rädler, M., Sienkiewicz, A., Sharma, S., Skurzok, M., Stępień, E. Ł., Szumlak, T., Tanty, P., Ardebili, K. Tayefi, Tiwari, S., Moskal, P.
Format:	Preprint
Published:	2025
Subjects:	Nuclear Experiment High Energy Physics - Experiment
Online Access:	Acceder al recurso
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_version_	1866908674054684672
author	Chug, N. Bass, S. D. Beyene, E. Y. Curceanu, C. Czerwiński, E. Das, M. Eliyan, K. V. Gorgol, M. Hajduga, J. Jalali, S. Jasińska, B. Kacprzak, K. Kaplanoglu, T. Kapłon, Ł. Kasperska, K. Khreptak, A. Kierys, A. Korcyl, G. Kozik, T. Kubat, K. Kumar, D. Venadan, A. Kunimmal Lisowski, E. Lisowski, F. Mędrala-Sowa, J. Moyo, S. Mryka, W. Niedźwiecki, S. Pandey, P. Parzych, S. del Río, E. Pérez Porcelli, A. Rachwał, B. Rädler, M. Sienkiewicz, A. Sharma, S. Skurzok, M. Stępień, E. Ł. Szumlak, T. Tanty, P. Ardebili, K. Tayefi Tiwari, S. Moskal, P.
author_facet	Chug, N. Bass, S. D. Beyene, E. Y. Curceanu, C. Czerwiński, E. Das, M. Eliyan, K. V. Gorgol, M. Hajduga, J. Jalali, S. Jasińska, B. Kacprzak, K. Kaplanoglu, T. Kapłon, Ł. Kasperska, K. Khreptak, A. Kierys, A. Korcyl, G. Kozik, T. Kubat, K. Kumar, D. Venadan, A. Kunimmal Lisowski, E. Lisowski, F. Mędrala-Sowa, J. Moyo, S. Mryka, W. Niedźwiecki, S. Pandey, P. Parzych, S. del Río, E. Pérez Porcelli, A. Rachwał, B. Rädler, M. Sienkiewicz, A. Sharma, S. Skurzok, M. Stępień, E. Ł. Szumlak, T. Tanty, P. Ardebili, K. Tayefi Tiwari, S. Moskal, P.
contents	A direct test of the CPT symmetry is performed for the electromagnetic decays of ortho-positronium using the J-PET tomograph. We present the precise measurement of the CPT-sensitive angular correlation entailing the positronium spin and the momenta of its annihilation photons, surpassing previous studies utilizing the same detection system. Positrons originating from a $^{22}$Na source are emitted from the detector's center and subsequently form positronium atoms within the spherical chamber covered with porous material. Reconstruction of annihilation locations using the 192-strip J-PET detector makes it possible to determine the positronium emission direction, which defines the quantization axis along which positronium is polarized, without the application of external magnetic fields. The measurements were performed in total for 356 days resulting in an identification of 47.8 million events with ortho-positronium decays into three photons. The results are consistent with the exactness of CPT symmetry with measured asymmetry amplitude -0.00029 $\pm$ 0.00022 (stat.) and with statistical error four times smaller than the previous best measurement.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_20098
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Studies of CPT symmetry in positronium decays with 192 plastic strip J-PET detector Chug, N. Bass, S. D. Beyene, E. Y. Curceanu, C. Czerwiński, E. Das, M. Eliyan, K. V. Gorgol, M. Hajduga, J. Jalali, S. Jasińska, B. Kacprzak, K. Kaplanoglu, T. Kapłon, Ł. Kasperska, K. Khreptak, A. Kierys, A. Korcyl, G. Kozik, T. Kubat, K. Kumar, D. Venadan, A. Kunimmal Lisowski, E. Lisowski, F. Mędrala-Sowa, J. Moyo, S. Mryka, W. Niedźwiecki, S. Pandey, P. Parzych, S. del Río, E. Pérez Porcelli, A. Rachwał, B. Rädler, M. Sienkiewicz, A. Sharma, S. Skurzok, M. Stępień, E. Ł. Szumlak, T. Tanty, P. Ardebili, K. Tayefi Tiwari, S. Moskal, P. Nuclear Experiment High Energy Physics - Experiment A direct test of the CPT symmetry is performed for the electromagnetic decays of ortho-positronium using the J-PET tomograph. We present the precise measurement of the CPT-sensitive angular correlation entailing the positronium spin and the momenta of its annihilation photons, surpassing previous studies utilizing the same detection system. Positrons originating from a $^{22}$Na source are emitted from the detector's center and subsequently form positronium atoms within the spherical chamber covered with porous material. Reconstruction of annihilation locations using the 192-strip J-PET detector makes it possible to determine the positronium emission direction, which defines the quantization axis along which positronium is polarized, without the application of external magnetic fields. The measurements were performed in total for 356 days resulting in an identification of 47.8 million events with ortho-positronium decays into three photons. The results are consistent with the exactness of CPT symmetry with measured asymmetry amplitude -0.00029 $\pm$ 0.00022 (stat.) and with statistical error four times smaller than the previous best measurement.
title	Studies of CPT symmetry in positronium decays with 192 plastic strip J-PET detector
topic	Nuclear Experiment High Energy Physics - Experiment
url	https://arxiv.org/abs/2511.20098